protocolVersion

Version of the Sale to POI protocol specifications. For this version of specification, the value is "3.1" Used for messages send outside a session, i.e. which are not between a Login and a Logout. In the Login data request, the Sale System sends the highest version of the Sale to POI protocol it can manage. In the Login data response, the POI System answers with the version of the Sale to POI protocol it will use. The version of the protocol sent in the Login request and response are valid for all the messages inside the session. Format of the protocol version is 'MM.mm', where MM is the major version number and mm the minor version number